^Six-month pre-post study on 152 participants, conducted by the University of North Carolina at Chapel Hill, Weight Research Lab. Study funded by Weight Watchers. Sleep data and happiness data reported by trial participants after 6 months on WW Freestyle based on the Pittsburgh Sleep Quality Index and the Oxford Happiness Questionnaire.

Comparing the weight loss after 6 months for WW Digital members who joined in the first 8 weeks of 2018 vs. those who joined in the first 8 weeks of 2017.